Python Practice One

Login Interface Exercises

Requirements: Read the account file, login three times the wrong password will lock and write to the lock file

# python 3.6  Login Interface Practice # _*_ coding:utf-8 _*_import sysimport osimport  getpassi = 0while i < 3:  #  continuously loops as long as the user logs in abnormally not more than 3 times      name = input ("Please enter user name:")      #lock_file  = open (' Account_ Lock.txt ',  ' r+ ')   #  when the user enters the user name, open the lock  file   to check if the user is already lock   (open with with)      with open (' Account_lock.txt ', ' R ')  as lock_file :         lock_list = lock_file.readlines ()     for lock_line  in lock_list:  #  Loop Lock File         lock_line  = lock_line.strip (' \ n ')   #  Remove line break         if  name == lock_line:  #  Exit         If lock is the right      syS.exit (' User  {_name}  has been locked, exited '. Format (_name=name))    # user_file = open ( ' Accounts.txt ',  ' r ')   #  open account file (using with open)     with open (' Accounts.txt ', ' R ')  as user_file :       user_list =  user_file.readlines ()     for user_line in user_list:  #   Traverse the account file          (User, password)  = user_ Line.strip (' \ n '). Split ()   #  get account and password information separately         if  name == user:  #  If the user name matches correctly              j = 0            while  j < 3:  #  continuous circulation           as long as the user password is not more than 3 times        passwd = getpass.getpass (' Please enter password: ')   #  enter hidden password                  if passwd == password:   #  password is correct, prompt Welcome to login                      print (' Welcome login management Platform, user%s '  % name)                      sys.exit (0)    #  Normal Exit                  else:                     if j != 2:  # j=2 is the last chance to have 0 more chances left in the tip                           print (' User  %s  password error, please re-enter, and  %d  chance '  %  (name, 2 - j))                  j += 1  #  The loop value increases 1            else:    after password input error              with open (' Account_lock.txt ' A + ')  as lock_file :   # (opens again using with)                    lock_file.write (name +  ' \ n ')    #  password entered three times after the error, append the user to the lock file                  sys.exit (' User  %s  maximum login count, will be locked and exited '  % name ')          else:            pass   #  when the user does not match, Skip and Continue looping     else:        if i != 2:   # i=2 is the last chance to have 0 more chances left in the tip              print (' User  %s  not present, please re-enter, also  %d  chance '  %  (name, 2 - i))     i += 1  #  the loop value increases 1else:     when the user enters an error Sys.exit (' User  %s  not present, exit '  % name ')   #  user entered three errors after the exception exits #lock_file.close ()    #  Close lock file, use with optimization to remove #user_file.close ()   #  Close account file

This article is from the "MG05 Learning Notes ~" blog, please be sure to keep this source http://pimg2005.blog.51cto.com/842469/1980637

Python Practice One